Design approaches for bodyworn RFID tags

Bodyworn tags are a challenging application for radio frequency identification (RFID) systems. The importance of this application will increase in the future due to emerging novel wireless identification and sensor systems. In this paper, a literature survey of wearable RFID tag antennas is presented. One-layer and multilayer tags are compared. The body effect on antenna parameters is analysed. Based on the findings, guidelines for wearable tag antenna design are given. As an example of a bodyworn tag, a meandered dipole is presented.